2. From the resort’s website
Glass igloo provides an one of a kind opportunity to admire the northern lights and millions of stars of the crystal clear sky in a comfortable room temperature. Built from a special thermal glass the temperature inside the igloo always stays a normal level. It also prevents the glass from not getting white frosted, hence keeping the view clear even when the temperature outside drops to under -30°C. Every igloo is equipped with a toilet and luxury beds.